Double-acting clamp.



1.. M. GGODKNIGHT:

DQUBL-E ACTING CLAMP.

APPLICATION FILED APR. so. 1908.

Patented Mar. 9, 1909.

INVEN 7 01%; 7

w Z/K A TTORNE y.

1 #L P 445 Tlglw Lml W] TNESSES in section of the invention.

' 1*. 1 q i rii E "V i t "w W1" UIO iC-Il 51C Lib\ ittlOll 01 L nn, Q8/1138. i if) 1 1s ,a section on line Ill-1Il 01 Fig. rig; 4 is the head-block and the leve- Unis siraans Jonnn. GOODKNTGHT,

DOUBLE-A0111.

Application filed April 86*, 3.908.

Specification of Letters l etent.

Patented March 9, 1909 Eerie! No. 310,690,

Be it known that I. Join iii. GooimNion'i, a citizen of the United fitz-itr-sfrceh' Ka isas City, in the county cl iiyandr State ot Kansas, have inventml oer n new and useful improvements in ileaihisa so Clamps, oi" wh'sh' the following: is a ape-innit tron.

lyiy inventionrelates to improvements in double-acting clamps; and my object provide a simple, inexpensive tool of this character for the use otcarpenters, eabinetmakers, car-builders, and all mechanics having use for a tool of this character.

The tool embraces a stationary head-bleak and a movable head-block, and is (lonhl ':-aet ing,--that is its power may be exerted in a contract or clamping manner by forcing; its movable headblock tor 1 its stationary head-block, or power 11 I used in an expansive manner by fore as; its 'inovable head-block awayv from the stationary headblock.

The tool also embraces means foractuating the movable head-block, consisting ahand lever which may be operated either in pen pendicular or a horizontal position.

In order that the invention may fully understood, reference will now be made to the accompanying drawing, in which:

Figure 1 represents a side elevation partly Fig. is a a detail s le elevation of key employed in carrying out the invention. Fig. an adetail cross section on line i -Y ot a rack-bar employed in earryhng; out the invention. Fig. 6 is a broken cross-section of a modified form. Fig. 7 shows amodiiied form of headblookp 1 designates a rack-bar provided with two rowsof marginal teeth 2.

3 designates a stationary head-block de tachably secured to'one end of the rack-bar by bolts or pins l, so that headblocks of different shapes and suitable for diii'eront kinds of work may be substituted for the headblock 3. y

designates a .inovablo head-block slidably mount ed up on the rack-b so that it in ay be adjusted toward or away from head-block 3. Head-block 5 is actuated by means of an oscillatory hand-lover 6 connected thereto by 5 *eiigagoowiit with a pair of links 7, secured to opposite sides of by studs Hand-lever (3 consists of two sections 9 and "adap'ed t whie has a recess in itslower pora ehamb 11 for the reception 3' whereby the lever and head aneed or retracted uponthe his mechanism eonsis'ts of two s and 13, and two U- and i5, adaotech'resped pearls i123. Springs with seats is and 1:3 to is or" two keys, hereinafter de- "(r-tally mounted belt" or disposed "fi-sh o be I niinals of heir gee" 14 15 pit 'otally mo 19 provided with sleeves which extend. transversely through the, lever and abut their ends against the heads of bolt i9 and their retaining-nuts 2i. Sleeves 20 prevent the sides of chamber 11 from being forced by the retaining-nuts int-o trietional engagement with the pan'ls and the springs and tints in teriering with their inoyeinits.

22 23 designate two keys the bits of which are arranged between springs let 15, respectively, forv the purpose oi. alternately adjust ing the ends of the same into or out of en gagenient with the T shaped nortions of the pan'ls. 'l'he'shanhs 24 of tie keys extend outward through one side of the chamber 11 and are rcfirided with handles '26 27 res eetively, pii-"otally S(J?-a';16(l thereto, so that said handles inay fold beside the adjacent Gila/111* her well, 21' indicated by dotted lines, Fig. 3, when not in use and be protected from injury by the surrounding flanges of two eseutcl eons 28, secured to the adjacent side wall of the chamber. The handles of the keys have error-rs 2). \\'hich point in the sanie i rection as the bits, so that the exact location-- of the latter can bormidirv ascertained preparatory to adjusting the springs. I

When it desired to move head-block 5 toward hoad-bioek 3 for the purpose of clamping the different portions of a. piece of work together, keys 23 are adjusted to the position shown in l 1, to throw the forward ends of springs 14 15 into contort with the T-shapedhoads 1 and 18 of the pawls. The pressure of the springs against said T-shaped heads towns the rear ends of the pawls into theteeth of the rat-lobar,

hence when the upper end of the lever is swung back and forth the pawls alternately have centrally" act as fulcrum points therefor so that it may move head-block forward. When it is desired to move head-block 5 backward the position of the springs and the awls is reversed, so that the rear ends of the atter Will'engage the teeth onthe rack-bar. When it is desired to slidehead-block. 5 for any distance upon the rack-bar, both ends of the pawls are thrown out of enga ement with said rack-bar by adjusting the its of'the keys to a neutral osition between the arms of the springs- This permits rapid adjustment of t eclamp for either large or small work. In order that the lever mayoperate smoothly and rapidly upon the rack-bar, I provide said lever with a pair of guides 31 secured thereto by ivots 32, so that the straight edges of sai guides may remain parallel to the rack-bar while the lever is being oscillated. The rack-bar is of the same size throughout its length, so thatwhen desired the lever may be easily removed therefrom. The

- movable head-block'5 may likewise beremoved when it is'desired to substitute another of different form therefor, one for instance like the head-block 3, shown by F1 7. a I

%n the modified form, Fig. 6, 1 designates the ratchet bar which is provided with ratchet-teeth 2 on all four of its sides. 6 designates the hand-lever, and 11 the chamber in the lower portion thereof.

'By making the ratchet-bar square in crosssection and providing its four sides with teeth 2 the hand-lever may beplaced'thereon eit'. L61 in a vertical or a horizontal posi tion. This" is a decided advantage as it permits the hand-lever to be operated in 'situa-' tions it would be im ossible to operate in; in

horizontal.

case it had to exten either in a vertical-Ora plosition.

us described my invention, what Having t I claim is 1. A clamp consistin of a rack-bar, stationary and adjustable lead-blocks thereon, an oscillatory-lever connected to the adjustable head-block and adapted to travel therewith on the rack-bar, and a pair of doubleacting pawls carried by the lever which en gage the rack-bar and alternately act as ful-' crumlpo'ints for said lever.

. .Inovable h ad-block l of Paw-blamed;

by the lever which engage the rack-bar and.

alternately act as fulcrum points for said lever, and guides pivoted to the lever engaging opposite sides of the rack-bar.

4. A clamp consisting of a rack-bar, sta- .tionary and ad ustable head-blocks thereon,

an oscillatory-lever connected to the adjustable. head-block and adapted to travel therewith on the rack-bar, a pair of double-acting 'pawls engaging opposite sides of the rack-bar andpivotally secured to said lever, yielding means for holding the ends of the pawls in engagement with the raclebar, and keys carried by the leverifor reversing. said yielding means. I

5. A clamp-consisting of a rack-bar, stationary and adjustable head-blocks thereon, an oscillatory-lever connected to the adjustable head-block and adapted to travel there- .with on the rack-bar, a pair of reversible "pawls engaging opposite sides of the rack-bar and pivotally secured to the lever, ap'air of springs pivoted to the lever and provided with terminals adapted'to alternately engage the pawls, and means carried by the lever-for reversing the springs.

6. A clamp consisting of a rack-bar, stationary and adjustable head-blocks thereon, anoscillatory-le'ver connected to the adjust able head-block and adapted to travel therewithon the rack-bar a' air of reversible pawlsengaging opposite si es of the rack-bar ;and pivotallysecured to the lever, a ,pair of springs pivoted to the lever and providedwith terminals adapted to alternately engage the pawls, keys for reversing the springs prg vided with folding handles at one side offhe' lever, and means on said side ofth'e rcver for protecting the handles.

7. A clamp consisting of a rack-bar which is substantially square in cross-seetion and provided with teeth on its four sides,'a lever adapted to operate on said raek-bar' either in a perpendicular or a horizontal position, pawls carried by the lever which engage the rack-bar and alternately act as a fulcrumfor said lever, and stationary and adjustable head-blocks on the raclebar, said adjustable head-block being suitably connected to the lever..-

8. A clamp consisting of a rack ba stationary and adjustable head-blocksthereon, an oscillatory-lever connected to the adjustv able head-block, a pair of double-acting pawls adapted to engage opposite sides of the rac'leba'r and provided with centrally-dis-.

posed heads, and means engaging said heads adapted to either reverse the pawls' or hold them out of engagement with the rack-bar.

In testimony whereof I affix my signature,

in the presence of two witnesses. I

- I JOHN M. GOODKNIGHT. .Witnessesz t F. G. FISCHER, MJOox. 

